Article
Chemistry, Multidisciplinary
Jifeng Shao, Yuntian Liu, Meng Zeng, Jingyuan Li, Xuefeng Wu, Xiao-Ming Ma, Feng Jin, Ruie Lu, Yichen Sun, Mingqiang Gu, Kedong Wang, Wenbin Wu, Liusuo Wu, Chang Liu, Qihang Liu, Yue Zhao
Summary: The magnetic properties of MnBi2Te4(Bi2Te3)(n) can be manipulated by tuning the number of Bi2Te3 spacer layers n, with opposite responses observed for n = 1 and 2 under hydrostatic pressure. This is due to the essential role of intralayer exchange coupling from lattice compression in determining the magnetic properties, leading to a phase transition from A-type antiferromagnetic to quasi-two-dimensional ferromagnetic state. Such magnetic phase transition is also observed in 20% Sb-doped MnBi6Te10 due to in-plane lattice compression.
Article
Multidisciplinary Sciences
Rui Wang, Tigran A. Sedrakyan, Baigeng Wang, Lingjie Du, Rui-Rui Du
Summary: Correlation and frustration are important in physics, leading to new quantum phases. In this study, we observe the moat-band phenomena in shallowly inverted InAs/GaSb quantum wells, where we find an unconventional time-reversal-symmetry breaking excitonic ground state. We demonstrate the evolution from helical-like to chiral-like edge transport and explain our experimental observations using a moat band for excitons that results from density imbalance.
Article
Chemistry, Physical
Aiyun Luo, Zhida Song, Gang Xu
Summary: By using first-principles calculations and magnetic topological quantum chemistry, this study reveals the presence of fragile topological electronic states in the antiferromagnetic monolayer FeSe, which is very close to an antiferromagnetic topological insulator with robust edge states. These fragile topological states are captured by a double-degenerate nearly flat band just below the Fermi level. The S-4z symmetry is found to protect this fragile topology, leading to a 2D second-order topological insulator that supports a bound state with fractional charge e/2 at the corner of the sample. This work provides an important platform for studying the intriguing properties of magnetic fragile topological electronic states and can explain previous observations in the checkerboard antiferromagnetic monolayer FeSe.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Physics, Condensed Matter
Ai Suzuki, Tomoya Taguchi, Huan Li, Yanan Wang, Hirofumi Ishii, Yen-Fa Liao, Hidenori Goto, Ritsuko Eguchi, Yoshihiro Kubozono
Summary: The study investigated the crystal structure and superconductivity of the topological insulator PdBi2 under pressure, revealing stable superconductivity and a high superconducting transition temperature in the beta phase. Unlike the alpha phase, the beta phase did not undergo structural phase transitions under pressure.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Multidisciplinary
Wen-Ti Guo, Lu Huang, Yanmin Yang, Zhigao Huang, Jian-Min Zhang
Summary: This study demonstrates that pressure strain can induce a topological quantum phase transition in the magnetic topological insulator MnBi2Te4 by modulating its electronic band structure. The findings suggest that strain engineering could be a feasible approach for manipulating the electronic properties of intrinsic magnetic insulators.
NEW JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yingyi Huang
Summary: We study the emergence of topological Floquet flat bands in alternating-twist multilayer graphene near the first magic angle. By applying a circularly polarized laser beam, a gap can be opened at the Moire K point, creating Floquet flat bands with non-zero Chern numbers. These dynamically produced topological flat bands can potentially be observed in experiments and offer a feasible way to realize the fractional Chern insulator.
Article
Chemistry, Physical
Robin Guehne, Grant V. M. Williams, Shen Chong, Juergen Haase
Summary: This research demonstrates that Bi-209 nuclear magnetic resonance can be used to study the bulk band inversion and field-induced charge rotation in topological insulators, providing insights into the electronic properties of these materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Saeed Samadi, Rafal Rechcinski, Ryszard Buczko
Summary: The topological electronic structure of a single twin boundary and coherent twinning superlattices based on SnTe materials is studied. Different types of twin planes and supercells are constructed to investigate the topological phases. The findings suggest that each type of twin plane forms a two-dimensional mirror-plane-protected topological crystalline insulator.
Article
Materials Science, Multidisciplinary
Guan-Hao Feng, Hong-Hao Zhang, Zhongbo Yan
Summary: This study demonstrates that various topological insulating phases can be found in bilayer Dirac materials, and intrinsic odd-parity superconductivity can arise in these systems through doping and short-range attractive interactions. The number and positions of Fermi surfaces result in different topological superconducting phases.
Article
Materials Science, Multidisciplinary
Kazuaki Takasan, Shuntaro Sumita, Youichi Yanase
Summary: We demonstrate that finite current can induce topological phase transitions in superconductors by deforming the quasiparticle spectrum through the finite center-of-mass momentum of Cooper pairs. We examine the topological properties of three prototypical systems and show that all models exhibit current-induced topological phase transitions. We discuss the possibility of observing these phase transitions in experiments and their relation to other pairing states with finite center-of-mass momentum.
Article
Chemistry, Multidisciplinary
Yao Li, John W. Bowers, Joseph A. Hlevyack, Meng-Kai Lin, Tai-Chang Chiang
Summary: Epitaxial thin-film heterostructures provide a platform for realizing topological surface states, and the experimental demonstration presented here confirms the formation of emergent topological states in such heterostructures. The results illustrate the rich physics of engineered composite topological systems that may be exploited for nanoscale spintronics applications.
Article
Multidisciplinary Sciences
Martin Claassen, Lede Xian, Dante M. Kennes, Angel Rubio
Summary: The study predicts that twisted bilayers of ZrS2 with the group-IV metal Zr can form an emergent moire Kagome lattice with strong spin-orbit coupling, leading to novel topological quantum phases dominated by strong spin-orbit interactions. At small twist angles, ZrS2 heterostructures give rise to an emergent and twist-controlled moire Kagome lattice, combining geometric frustration and strong spin-orbit coupling to realize a moire quantum spin Hall insulator with highly controllable and nearly-dispersionless bands.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Amit Kumar, Shiv Kumar, Yudai Miyai, Kenya Shimada
Summary: This study investigates the temperature-dependent band structure and energy dependence of the electron-phonon interaction of the topological surface state (TSS) on the three-dimensional topological insulator Bi2Te3 using angle-resolved photoemission spectroscopy. The findings reveal that the degeneracy at the Dirac point (DP) remains robust with increasing temperature, indicating topological protection. Additionally, the electron-phonon coupling parameter is shown to depend on the initial-state electron energy.
Article
Chemistry, Physical
Xiaofeng Liu, Yubing Si, Kai Li, Yanan Xu, Zhipeng Zhao, Chuanqi Li, Yongzhu Fu, Dan Li
Summary: This study synthesized a high-conductive polypyrrole encapsulated Bi2Te3 composite, demonstrating excellent electrochemical performance and stability in sodium ion batteries. The reaction mechanism of the composite was revealed through experiments and calculations, providing a reliable strategy for the development of topological insulator as anode materials for sodium-ion batteries.
ENERGY STORAGE MATERIALS
(2021)
Article
Optics
E. A. Hurtado-Aviles, M. Trejo-Valdez, J. A. Torres, C. J. Ramos-Torres, H. Martinez-Gutierrez, C. Torres-Torres
Summary: This study explores the use of third-order nonlinear optical effects for simultaneous speed modulation of optical and mechanical waves in bismuth telluride nanostructures, assisted by optical two-wave mixing. Various techniques were used to characterize the Bi2Te3 nanostructures and analyze their unique polarization-selectable nonlinear optical response, suggesting potential applications for structured light systems.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Physics, Condensed Matter
Akihiro Mitsuda, Shigeki Manabe, Masafumi Umeda, Hirofumi Wada, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Masaichiro Mizumaki, Naomi Kawamura, Kiyofumi Nitta, Naohisa Hirao, Yasuo Ohishi, Naoki Ishimatsu
JOURNAL OF PHYSICS-CONDENSED MATTER
(2018)
Article
Physics, Multidisciplinary
Bosen Wang, Yaoqing Zhang, Shuxiang Xu, Kento Ishigaki, Kazuyuki Matsubayashi, Jin-Guang Cheng, Hideo Hosono, Yoshiya Uwatoko
Article
Multidisciplinary Sciences
Tatsunori Okada, Yoshinori Imai, Kentaro Kitagawa, Kazuyuki Matsubayashi, Masamichi Nakajima, Akira Iyo, Yoshiya Uwatoko, Hiroshi Eisaki, Atsutaka Maeda
SCIENTIFIC REPORTS
(2020)
Article
Materials Science, Multidisciplinary
Takuya Deguchi, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Takehide Koyama, Takao Kohara, Hiroyuki Nakamura, Yoshifuru Mitsui, Keiichi Koyama
MATERIALS TRANSACTIONS
(2020)
Article
Physics, Multidisciplinary
Kazuyuki Matsubayashi, Hidekazu Okamura, Takashi Mizokawa, Naoyuki Katayama, Akitoshi Nakano, Hiroshi Sawa, Tatsuya Kaneko, Tatsuya Toriyama, Takehisa Konishi, Yukinori Ohta, Hiroto Arima, Rina Yamanaka, Akihiko Hisada, Taku Okada, Yuka Ikemoto, Taro Moriwaki, Koji Munakata, Akiko Nakao, Minoru Nohara, Yangfan Lu, Hidenori Takagi, Yoshiya Uwatoko
Summary: The excitonic insulator Ta2NiSe5 undergoes a first-order structural transition under pressure, leading to changes from a ripple to flat layer structure and ultimately changing the material from an almost zero-gap semiconductor to a semimetal with partial bandgap. This transition is accompanied by monoclinic distortion and is influenced by electron-lattice coupling. Superconductivity emerges around a certain pressure range, likely mediated by electron-coupled soft phonons.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Physics, Multidisciplinary
Hiroto Arima, Yoshiaki Oshita, Daigorou Hirai, Zenji Hiroi, Kazuyuki Matsubayashi
Summary: In this study, we measured the electrical and magnetic properties of Ba2MgReO6 under pressure. The transition temperature to canted antiferromagnetic order increases gradually with increasing pressure, while the quadrupolar order is suppressed above 5 GPa, leading to the appearance of a collinear antiferromagnetic state. The phase diagram obtained suggests that Ba2MgReO6 is located near the phase boundary between noncollinear and collinear antiferromagnetic order.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Materials Science, Multidisciplinary
Hitoshi Yamaoka, Aichi Yamashita, Yuki Nakahira, Masayuki Ochi, Kazuhiko Kuroki, Hiroto Arima, Kazuyuki Matsubayashi, Hirofumi Ishii, Nozomu Hiraoka, Yoshikazu Mizuguchi
Summary: Sr1-xXxFBiS2 undergoes a pressure-induced structural transition around 1 GPa, changing from unconventional superconductivity in the low-pressure phase to conventional superconductivity in the high-pressure phase. The electronic structure of Sr1-xXxFBiS2 shows significant changes with pressure, leading to a transition from a semiconductor-like state to a more metallic state. Additionally, high-pressure phase exhibits an increase in empty states of Bi s and d (t2g) bands above the Fermi level.
Article
Materials Science, Multidisciplinary
Y. Yuan, H. Arima, M. Masaoka, Y. Naito, Y. Hijikata, R. Jha, Y. Mizuguchi, K. Matsubayashi
Summary: The effect of pressure on the electrical transport properties of the four-layer-type bismuth chalcogenide semiconductors LaOPbBiS3 and La2O2Bi3AgS6 and the discovery of pressure-induced superconductivity are reported. The semiconductor-like behavior in both compounds gradually weakens with increasing pressure while the superconductivity develops. The results indicate that the enhancement of superconductivity is attributed to the disorder near the localization threshold in these materials.
Proceedings Paper
Chemistry, Physical
H. Arima, Y. Naito, K. Kudo, N. Katayama, H. Sawa, M. Nohara, Y. F. Lu, K. Kitagawa, H. Takagi, Y. Uwatoko, K. Matsubayashi
27TH AIRAPT INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
Noriki Terada, Claire Colin, Navid Qureshi, Thomas C. Hansen, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Alexei A. Belik
Article
Materials Science, Multidisciplinary
Susumu Katano, Masayuki Ito, Kohei Shibata, Jun Gouchi, Yoshiya Uwatoko, Kazuyuki Matsubayashi, Hideto Soeda, Hiroki Takahashi
Article
Materials Science, Multidisciplinary
Bosen Wang, Zhi-Cheng Wang, Kento Ishigaki, Kazuyuki Matsubayashi, Tetsujiro Eto, Jianping Sun, Jin-Guang Cheng, Guang-Han Cao, Yoshiya Uwatoko
Proceedings Paper
Materials Science, Multidisciplinary
Yukihiro Kawamura, Chihiro Sekine, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Takashi Nishioka
THERMEC 2018: 10TH INTERNATIONAL CONFERENCE ON PROCESSING AND MANUFACTURING OF ADVANCED MATERIALS
(2018)
Article
Materials Science, Multidisciplinary
Bosen Wang, Xuan Luo, Kento Ishigaki, Kazuyuki Matsubayashi, Jinguang Cheng, Yuping Sun, Yoshiya Uwatoko
Article
Materials Science, Multidisciplinary
Bosen Wang, Yu Liu, Xuan Luo, Kento Ishigaki, Kazuyuki Matsubayashi, Wenjian Lu, Yuping Sun, Jinguang Cheng, Yoshiya Uwatoko
